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Fast Measurement and Reconstruction of Large Workpieces with Freeform Surfaces by Combining Local Scanning and Global Position Data.

Chen Z, Zhang F, Qu X, Liang B - Sensors (Basel) (2015)

Bottom Line: With the multi-sensor data fusion, errors accumulated during the image alignment and registration process are minimized, and the measuring precision is significantly improved.The results prove that this new combined method is promising for measuring and reconstructing the large-scale objects with complex surface geometry.Compared with reported methods of large-scale shape measurement, it owns high freedom in motion, high precision and high measurement speed in a wide measurement range.

View Article: PubMed Central - PubMed

Affiliation: State Key Lab of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China. cz19902013@sina.com.

ABSTRACT
In this paper, we propose a new approach for the measurement and reconstruction of large workpieces with freeform surfaces. The system consists of a handheld laser scanning sensor and a position sensor. The laser scanning sensor is used to acquire the surface and geometry information, and the position sensor is utilized to unify the scanning sensors into a global coordinate system. The measurement process includes data collection, multi-sensor data fusion and surface reconstruction. With the multi-sensor data fusion, errors accumulated during the image alignment and registration process are minimized, and the measuring precision is significantly improved. After the dense accurate acquisition of the three-dimensional (3-D) coordinates, the surface is reconstructed using a commercial software piece, based on the Non-Uniform Rational B-Splines (NURBS) surface. The system has been evaluated, both qualitatively and quantitatively, using reference measurements provided by a commercial laser scanning sensor. The method has been applied for the reconstruction of a large gear rim and the accuracy is up to 0.0963 mm. The results prove that this new combined method is promising for measuring and reconstructing the large-scale objects with complex surface geometry. Compared with reported methods of large-scale shape measurement, it owns high freedom in motion, high precision and high measurement speed in a wide measurement range.

No MeSH data available.


The ring gauge with the reference global position points.
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sensors-15-14328-f011: The ring gauge with the reference global position points.

Mentions: For the purpose of verifying the practicality of the proposed measurement method, a small ring gauge and a large-scale gear rim were chosen as measurement objects. Considering that there is no surface and geometry information to measure the length on the flat concrete wall, we apply this combined method on a ring gauge with the standard length of 500.125 mm, which is measured by the laser tracker, as shown in Figure 11. Similarly, the length is also measured only by MAXscan and the combined system, respectively. The comparative experiment results are shown in Figure 12. It is observed that the length measured by the combined measurement is closer to the standard. It has been successfully verified that combined measurement effectively reduces the accumulated error caused by a large number of image registration and transformation steps and improves the measurement accuracy.


Fast Measurement and Reconstruction of Large Workpieces with Freeform Surfaces by Combining Local Scanning and Global Position Data.

Chen Z, Zhang F, Qu X, Liang B - Sensors (Basel) (2015)

The ring gauge with the reference global position points.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4507636&req=5

sensors-15-14328-f011: The ring gauge with the reference global position points.
Mentions: For the purpose of verifying the practicality of the proposed measurement method, a small ring gauge and a large-scale gear rim were chosen as measurement objects. Considering that there is no surface and geometry information to measure the length on the flat concrete wall, we apply this combined method on a ring gauge with the standard length of 500.125 mm, which is measured by the laser tracker, as shown in Figure 11. Similarly, the length is also measured only by MAXscan and the combined system, respectively. The comparative experiment results are shown in Figure 12. It is observed that the length measured by the combined measurement is closer to the standard. It has been successfully verified that combined measurement effectively reduces the accumulated error caused by a large number of image registration and transformation steps and improves the measurement accuracy.

Bottom Line: With the multi-sensor data fusion, errors accumulated during the image alignment and registration process are minimized, and the measuring precision is significantly improved.The results prove that this new combined method is promising for measuring and reconstructing the large-scale objects with complex surface geometry.Compared with reported methods of large-scale shape measurement, it owns high freedom in motion, high precision and high measurement speed in a wide measurement range.

View Article: PubMed Central - PubMed

Affiliation: State Key Lab of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China. cz19902013@sina.com.

ABSTRACT
In this paper, we propose a new approach for the measurement and reconstruction of large workpieces with freeform surfaces. The system consists of a handheld laser scanning sensor and a position sensor. The laser scanning sensor is used to acquire the surface and geometry information, and the position sensor is utilized to unify the scanning sensors into a global coordinate system. The measurement process includes data collection, multi-sensor data fusion and surface reconstruction. With the multi-sensor data fusion, errors accumulated during the image alignment and registration process are minimized, and the measuring precision is significantly improved. After the dense accurate acquisition of the three-dimensional (3-D) coordinates, the surface is reconstructed using a commercial software piece, based on the Non-Uniform Rational B-Splines (NURBS) surface. The system has been evaluated, both qualitatively and quantitatively, using reference measurements provided by a commercial laser scanning sensor. The method has been applied for the reconstruction of a large gear rim and the accuracy is up to 0.0963 mm. The results prove that this new combined method is promising for measuring and reconstructing the large-scale objects with complex surface geometry. Compared with reported methods of large-scale shape measurement, it owns high freedom in motion, high precision and high measurement speed in a wide measurement range.

No MeSH data available.